Petroleum Goodies: API Gravity

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API Gravity Posted: 26 Feb 2011 08:27 AM PST API To Specific Gravity Calculation This is not brand new formula but very handy calculation to have. API Gravity = ( 141.5 / Specific Gravity ) – 131.5 Specific Gravity = 141.5 / ( 131.5 + API ) Example: pure water at 60 deg F with  a specific gravity of 1.0 would have an API gravity: API Gravity = ( 141.5 / 1.0 ) – 131.5 = 10 deg API Degree API Specific Gravity 10 1.000 15 0.966 20 0.934 25 0.904 30 0.876 35 0.850 40 0.825 45 0.802 50 0.780 55 0.759 60 0.739

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